Extension Refactor Tracker

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• Task
  EXT-035 document type ownership

  • Task
    Gate .pdf and .tree visibility through owner extensions (pdf_viewer, tree_table)
  • Task
    Cover disabled type behavior in content tree, search, and static tree tests
  • Task
    Move raw/download ownership fully behind the document/file owner path in EXT-023

• Task
  Move remaining core-owned route surfaces behind extensions where justified:

  • Task
    sidebar lazy/search branch helpers
  • Task
    raw markdown/download/static attachment routes
  • Task
    optional auth adjunct routes

• Task
  Replace vyasa/extensions_builtin/themes/__init__.py re-export shim with real moved theme package

• Task
  Revisit agent.py as optional extension

• Task
  Add contract tests for asset bundle emission and extension static build parity